Use the following choices to match the type of hypersensitivity to the example in question given below.
a. Type I hypersensitivity
b. Type II hypersensitivity
c. Type III hypersensitivity
d. Type IV hypersensitivity
e. All of the above
Due to immune complexes.

Verified step by step guidance

1. Step 1: Understand the classification of hypersensitivity reactions. There are four main types: Type I (immediate, IgE-mediated), Type II (antibody-mediated cytotoxic), Type III (immune complex-mediated), and Type IV (delayed, T-cell mediated).
2. Step 2: Identify the key phrase in the question: 'Due to immune complexes.' This indicates the involvement of antigen-antibody complexes that deposit in tissues and cause inflammation.
3. Step 3: Recall that Type III hypersensitivity reactions are characterized by the formation and deposition of immune complexes, which trigger complement activation and inflammation.
4. Step 4: Match the description 'Due to immune complexes' to the correct hypersensitivity type, which is Type III hypersensitivity.
5. Step 5: Confirm that the correct choice from the given options (a through e) is option c, corresponding to Type III hypersensitivity.

Key Concepts

Type III Hypersensitivity

Type III hypersensitivity involves immune complex-mediated reactions where antigen-antibody complexes deposit in tissues, triggering inflammation and tissue damage. These complexes activate complement and attract leukocytes, leading to conditions like serum sickness and certain autoimmune diseases.

Immune Complexes

Immune complexes are formed when antibodies bind to soluble antigens, creating aggregates that can circulate and deposit in various tissues. Their accumulation can provoke inflammatory responses, especially when clearance mechanisms fail, contributing to hypersensitivity reactions.

Classification of Hypersensitivity Types

Hypersensitivity reactions are classified into four types (I-IV) based on the immune mechanism involved: Type I (immediate, IgE-mediated), Type II (antibody-mediated cytotoxic), Type III (immune complex-mediated), and Type IV (delayed, T-cell mediated). Understanding these types aids in diagnosing and treating immune-related conditions.